[debug/rql] bind a uniq token per rql to trace its decomposition
This is aimed to be used by the RQL debug panel (and the SQL one later on) but
can also be used by other debugging tools.
### Requirements for tests in various cubicweb/**/test directories. ##### shared by several test foldersdocutilswebtest## cubicweb/testPygmentspycryptodomex#fyzz XXX pip install fails## cubicweb/devtools/testflake8## cubicweb/hooks/testpsycopg2-binary## cubicweb/pyramid/testpyramid >= 1.5.0waitress >= 0.8.9wsgicors >= 0.3pyramid_multiauthrepoze.lru## cubicweb/sobject/test